Paris Jackson Sparks Marriage Rumors by Using Boyfriend's Last Name on Instagram

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A change to Paris Jackson's Instagram account has sparked rumors that Michael Jackson's 17-year-old daughter may have secretly married boyfriend Chester Castellaw.

While Paris added the surname Castellaw to her Instagram account, a source close to the situation tells ET the marriage rumor is not true. What's more, as a minor, Paris would need the consent from one of her guardians -- grandmother Katherine Jackson or cousin TJ Jackson -- if she wanted to tie the knot right now.

MORE: Paris Jackson and Her Boyfriend Chester Castellaw Make Their Red Carpet Debut as a Couple

Still, their romance appears to be going strong, seeing how Paris shared a few PDA Instagram shots on Wednesday.

Paris has been dating her 18-year-old soccer player boyfriend since April, and they made their red carpet debut as a couple in May at the opening night of the Deaf West Theater's production of Spring Awakening in Los Angeles.

WATCH: Paris Jackson's Co-Guardian TJ on Her New Boyfriend

When ET spoke to Paris' cousin, TJ, in August, he gave Chester his stamp of approval.

"No one's perfect, but he's a good boy, so I approve of him," TJ said. "He treats her well. She's happy."

TJ went on to admit that while Chester might be in his good graces, it doesn't mean he's going to let his guard down.

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"He's a teenage boy, so like any parent, guardian, step-parent or adopted parent, you got to keep an eye on him," TJ said. "I was a young man too once, so I keep a close eye on him."